Many side effects not told to the public. Here is the list of serious adverse reactions that were reported after the drug went on market:

Body as a Whole: Swelling of the face or tongue, allergy, anaphylactic/anaphylactoid reactions
Dermatologic: Dermatitis, rash, eczema, urticaria, erythema multiforme, Stevens-Johnson Syndrome, toxic epidermal necrolysis
Digestive: Hepatitis, liver function tests abnormal
Cardiac: Arrhythmia
Gastrointestinal disorders: Gastrointestinal bleeding, hemorrhagic colitis
Neurologic: Seizure
Metabolic: Aggravation of diabetes
Psychiatric: Delirium, including symptoms such as altered level of consciousness, confusion, abnormal behavior, delusions, hallucinations, agitation, anxiety, nightmares

https://althealthworks.com/13911/common-flu-medication-is-a-dangerous-and-deadly-scam-caused-deaths-suicides-and-over-1800-psychiatric-episodesyelena/

https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD008965.pub4/abstract